JPH10313353A - Communication connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and also quickly construct a radio communication channel when a cable communication line is disconnected by intermittently sending a calling signal to a general telephone, constructing an analog signal path in other timings, converting an analog signal of the general telephone into a digital signal to transmit to a radio telephone and on the other hand, transmitting an analog signal from the radio telephone to a feeder circuit. SOLUTION: A communication connection circuit EQU mediates signal exchanges between two kinds telephones, i.e., a portable telephone 1 and a telephone set 2 based on the operation of a control circuit 3. A calling circuit 4 generates 16Hz calling tone under the control of the controlling part 3. A feeder circuit 6 intermittently sends a calling tone to the telephone set 2 under the control of the circuit 3, and on the other hand, feeds direct current voltage to the telephone set 2 in the other timings and constructs an analog signal path. A DTMF detection circuit 5 converts dial information that is outputted by the set 2 into a digital signal and transmits it to the circuit 3. A hybrid circuit 7 transmits a signal of the telephone 2 to the circuit 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication connection device capable of establishing a wireless communication line at any time as required, and more particularly to a communication connection device capable of effectively utilizing a general-purpose mobile phone to obtain a damage situation at the time of a disaster. And a simple type communication connection device capable of promptly notifying the user.

[0002]

Not to mention the actual example of the 1995 Great Hanshin Earthquake,
It is important to be able to smoothly communicate from the outside to the stricken area and to notify the stricken area to the outside without delay. However, in the event of a major disaster, the wired communication line between the affected area and the outside is often cut off. For this reason, for example, it is not possible to promptly communicate the damage situation of the branch office to the head office, or information from local governments Was not quickly transmitted to the center. In such a case, it is most desirable that wireless communication can be performed at any time from a key telephone set disposed at each desk of a company or government office, as needed. Also, as in the normal case,
It would be desirable to be able to call the key telephone in the affected area freely from outside. The present invention has been made based on this viewpoint, and an object of the present invention is to provide a wireless communication system capable of reliably and quickly establishing a wireless communication line even when a wired communication line is interrupted. To provide a communication connection device. Another subject of the present invention is:
It is an object of the present invention to provide a simple type communication connection device that can be called from a general telephone such as a key telephone and can be used not only at the time of disaster but also on a regular basis and with low running cost.

[0003]

In order to solve the above problems, the present invention is based on the operation of a control unit (3) which is located between a general telephone (2) and a radio telephone (1), and is provided therein. And a communication connecting device (EQ
U), a call circuit (4) for generating a call signal to the general telephone (2) based on the control of the control unit (3)
The intermittent transmission of the call signal to the general telephone (2) based on the control of the control unit (3), and the supply of the DC voltage to the general telephone (2) at other timings. A power supply circuit (6) for constructing an analog signal path (L ₊ ); and a power supply circuit (6) connected to the power supply circuit (6). The DTMF detection circuit (5) for transmitting the analog signal as the audio information output from the general telephone to the radio telephone, and the analog signal from the radio telephone for the power supply is connected to the power supply circuit (6). And a hybrid circuit (7) for transmitting the call to the circuit. General is to perform the call operation of a phone.

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments. FIG. 1 shows three mobile phones 1
_-1 to 1 _-3, a block diagram of a communication connection device EQU connecting three buttons and a telephone set 2 _-1 to 2 _-3. As shown in the figure, the mobile phone 1 and the key phone 2 are connected to respective connectors TE ₁ (TE _{1-1 to} TE _1-3 ) and TE ₂ (TE _2-1
ＴＥTE _2-3 ) to the communication connection unit EQU. Here, the key telephone 2 has a touch-tone function, and is usually connected via a key telephone main unit or a PBX. In this embodiment, the portable telephone 1 and the key telephone 2 are illustrated, but other telephones 9 may be used as long as they have equivalent functions.

[0005] As shown in the figure, this communication connection circuit EQU comprises:
A device that mediates signal transmission and reception between the two types of telephones 1 and 2 based on the operation of the control unit 3, a calling circuit 4 that generates a ringing tone of 16 Hz based on the control of the control unit 3, 3, a ringing tone is intermittently transmitted to the key telephone 2 under the control of the key telephone 3. At the other timings, a DC voltage is supplied to the key telephone 2 and a power supply circuit 6 for constructing an analog signal path, and the key telephone 2 DTMF that converts dial information to be output to a digital signal and transmits it to the control unit 3
It mainly includes a detection circuit 5 and a hybrid circuit 7 that transmits an analog signal output from the key telephone 2 to the mobile phone 1 and transmits an analog signal from the mobile phone to the power supply circuit 6. And the hybrid circuit 7
The hybrid main body unit 8 includes an input amplification unit 9, an output amplification unit 10, and a limiter 11.

[0006] Digital data TX1~TX3 output from the control unit 3 via the terminal TX1~TX3 connector TE _1-1 ~TE _1-3, is transmitted to the cellular phone 1 _-1 to 1 _-3 while, the digital data RX1~RX3 outputted from the mobile phone 1 _-1 to 1 _-3, connectors TE _1-1 ~
The information is transmitted to the control unit 3 via the terminals RX1 to RX3 of the TEs _1-3 . The analog signal output from the mobile phone 1 is transmitted to the key telephone 2 via the input amplifier 9 and the hybrid main body 8, while the analog signal output from the key telephone 2 is transmitted to the hybrid main body. 8, the output amplifier 10 and the limiter 11 are transmitted to the mobile phone 1.

As shown in FIG. 2, the control unit 3 mainly includes a CPU (specifically, M37733S4BFP) 12, a memory 13, and a decoder (specifically, 74HC138) 14. The memory 13 stores programs for implementing various functions of the present invention described below. The decoder 14 receives an address signal from the CPU 12, which generates a chip select signal DTMF1~DTMF3 DTMF detection circuit 5 _-1 5 _-3 shown in Fig. In FIG. 2, TXDA and RXDA (TXDA1 to TXDA3, R
XDA1 to RXDA3) are MF (M
F1 to MF3) are 16 Hz and RIN
G is the PSBL (PSBL1 to PSB) at the corresponding location in FIG.
L3) at the corresponding location in FIG. 8, LP (LP1 to LP3) at the corresponding location in FIG. 5, PSB (PSB1 to PSB3) at the corresponding location in FIG. 8, TMRG and HKUP (TMRG1 to TRG).
MRG3, HKUP1 to HKUP3) are connected to corresponding portions in FIG.

The 16 Hz calling circuit 4 is shown in detail in FIG. In FIG. 3, RING and 16
Hz (left side) is connected to the corresponding portion in FIG.
(Right side) is connected to the corresponding portion in FIG. CPU
The 16 Hz digital pulse output from the 12 output ports is level-converted by a plurality of stages of amplifying circuits, and then boosted by a boost transformer T to a 75 V _rms 16 Hz.
Generated in the call signal. The control signal RING output from the CPU 12 is an ON / OFF signal for the 16 Hz calling circuit 4.
Is normally controlled to be in the ON state.

FIG. 4 shows details of the DTMF circuit 5. When the push button PB is pressed on the key telephone 2, the DTMF circuit 5 recognizes which of the pressed buttons is 0-9, *, or #,
The corresponding digital data is transmitted to the CPU 12, and the three PB receivers 15 (specifically, TC353
02F). In FIG. 4, DTMF
And MF (DTMF1 to DTMF3, MF1 to MF3) are connected to corresponding portions in FIG. 2, and L ₊ (L1 _{+ to} L3 ₊ ) is connected to corresponding portions in FIG. When PB (push button) signals L1 _{+ to} L3 ₊ are applied to the analog input terminal AIN ₋ of the PB receiver 15, an interrupt is issued to the CPU 12 (MFINT, MF).
By reading 4-bit data in the interrupt processing program, it is possible to recognize what button was pressed. Note that L1 ₊ , L2 ₊ , and L3 ₊ in FIG.
From TEL ₊ terminal of the key telephone set 2 _-1 to 2 _-3 shown in, B1 terminal of C1 terminal → relay circuit RL of a relay circuit RL →
It is an analog signal (specifically, a PB signal) transmitted from the diode D1 to the electrolytic capacitor C.

FIG. 5 shows the power supply circuit 6, which includes a constant current circuit 16, an ON / OFF circuit 17, a timing circuit 18, a photocoupler 19, and a relay circuit RL.
And it is mainly composed. In FIG. 5, LP and TM
RG and HKUP are connected to the corresponding portions in FIG.
Hz ₊ and 16 Hz _- are connected to corresponding portions in FIG. Further, L3 ₊ and L3 _- are connected to corresponding portions in FIGS. 4 and 6. Note that TEL1 ₊ , TEL2 ₊ , TE
L3 ₊ is the positive side of the signal terminal of the key telephone 2 _-1 to 2 _-3, - signal terminal side is not represented TEL 1 _-, TE
L2 _-, TEL3 _- it is. Incidentally, FIG. 5 is an illustration only feeder circuit _6-3 about the key telephone set 2 _-3, key telephone 2 _-1, 2 _-2, constant current circuit 16, O
An N / OFF circuit 17, a timing circuit 18, a photocoupler 19, and a relay circuit RL are separately provided. In FIG. 5, an ON / OFF circuit 17 and a timing circuit 18 control signals LP and T from the CPU 12.
The output signal H of the photocoupler 19 is controlled by the MRG.
The KUP is transmitted to an input port of the CPU 12.

The relay circuit RL outputs the control signal TMRG at H level.
Depending on the / L level, the B1 and B2 terminals are connected to the C1 and C2 terminals, or the M1 and M2 terminals are connected to the C1 and C2 terminals.
Connected to terminal. The terminals M1 and M2 are connected to the terminals 1 shown in FIG.
Since the 16-Hz signal generated by the 6-Hz calling circuit 4 is supplied, a ringing tone is supplied to the key telephone 2 in accordance with the control of the control signal TMRG. Also, +
The DC voltage of 24 V is converted from the constant current circuit 16 to the diode D1.
→ B1 terminal of the relay circuit RL → Through the C1 terminal of the relay circuit RL, as a constant current of 30 mA, the key telephone _2-1.
~ _2-3 . In this power supply state, the TEL1 _{+ to} TEL3 ₊ signals of the key telephone 2 pass through the P1 signal (L1) through the C1 terminal of the relay circuit RL → the B1 terminal of the relay circuit RL → the diode D1 → the electrolytic capacitor C.
1 _{+ to} L3 ₊ ) is transmitted to the DTMF detection circuit 5 in FIG. 4 as described in the preceding paragraph. The analog signals TEL1 _{+ to} TEL3 ₊ are transmitted to the hybrid circuit 7 shown in FIG.
_{1+ to} L3 ₊ ).

FIG. 6 shows the hybrid circuit 7 (7 _-3 ) in detail, and shows the relationship among the hybrid body 8, the input amplifiers 9a and 9b, the output amplifiers 10a and 10b, and the limiter 11. Have been. In FIG. 6, RX
A3 and TXA3 is connected to the corresponding part of Figure 8, L3 ₊
And L3 _- are connected to corresponding portions in FIG. The analog signal L3 ₊ applied from the key telephone 2 through the relay circuit RL of FIG. 5 is supplied to the connector TE _1-3 of the mobile telephone 1 as an analog signal TXA3 through the amplifier 10a, the limiter 11, and the amplifier 10b (FIG. 1, see FIG. 8). On the other hand, the analog signal RXA3 from the mobile phone 1
Is amplified by the amplifiers 9a and 9b, and then the analog signal L
3 ₊ is supplied to the key telephone 2 through the relay circuit RL in FIG. The hybrid circuits 7 _-1 and 7 _{-2 (} not shown) have exactly the same circuit configuration.
After all, T of the connector for key telephones TE _{2-1 to} TE _2-3
EL1 _{+ to} TEL3 ₊ terminals (FIG. 5) ⇔three relay circuits RL (FIG. 5) ⇔analog signals L1 _{+ to} L3 ₊ (FIGS. 5 and 6) ⇔audio signals TXA1 to TXA of hybrid circuit 7
3, RXA1 to RXA3 (FIGS. 6 and 8) ⇔A connection relationship between the mobile phone connectors TE _{1-1 to} TE _1-3 (FIG. 8) is realized.

[0013] Figure 7, the mobile phone 1 _-3 connector TE
_{FIG. 3} shows the connection relationship between _1-3 and the CPU 12 in detail. It should be noted that the connector TE _1-1, and TE _1-2 CPU12
The connection is completely the same. 7, TXDA3 and RXDA3 are connected to the CPU 12 of FIG. 2, and TXD3 and RXD3 are connected to the connector TE of FIG.
Connected to _1-3 . Output data T from CPU 12
XDA3 passes through the clamp circuit 20 to output data T
It is supplied to the connector TE _1-3 for a mobile phone as XD3 (Note that displaying the TX3 in FIG. 1). on the other hand,
The output data RXD3 from the mobile phone 1 passes through the clamp circuit 21 and the voltage conversion unit 22 to receive the input data RXD3.
A3 is supplied to the CPU 12 (in FIG. 1, R
X3).

FIG. 8 shows a connector TE _1-3 for a portable telephone.
2 illustrates the relationship between the portable device and the portable device charging circuit 23. The portable device charging circuit 23, but is for the mobile phone 1 _-3, the mobile phone 1 _-1, is exactly the same charging circuit also 1 _-2 are provided. In FIG. 8, TX
A1 to TXA3 and RXA1 to RXA3 are connected to corresponding portions in FIG. 6, and TXD1 to TXD3 and RXD1 to RXD
Reference numeral 3 is connected to a corresponding portion in FIG. Each of the connectors TE _{1-1 to} TE _1-3 for mobile phones has a GND
(1), analog output TXA (2), SG (3), digital output TXD (4), digital input RXD (5), POWER
(6), GND (7), analog input RXA (8), PCN1
(9), there are 10 terminals of PCN2 (10). And +
The DC voltage of 5.7 V is supplied to the POWER terminal (6) of the connector TE _1-3 through the constant current transistor 24, and the voltage to the POWER terminal (6) is divided by a resistor to provide an input terminal PSBL of the CPU 12. Supplied to The operation of the constant current transistor 24 is controlled by a control signal PSB from the CPU 12.

2 to 8, the mobile phone 1 and C
The connection relationship between the PU 12 and the key telephone 2 will be described below. The analog signals L1 _{+ to} L3 ₊ of the key telephone 2 (FIG. 5) pass through the hybrid circuit 7 of FIG. 6 to become analog output data TXA1 to TXA3, and the terminals TXA1 of the connectors TE _{1-1 to} TE _1-3 of FIG. ~ TXA3
Is input to On the other hand, analog signals from the cellular telephone 1 (Fig. 8) passes through the analog input terminal RXA1~RXA3 connectors TE _1-1 ~TE _1-3, applied to the hybrid circuit 7 in FIG. 6, the analog signals L1 ₊ ~ L3 ₊ is supplied to the key telephone 2 (FIG. 5). CPU1
The digital outputs TXDA1 to TXDA3 pass through the interface unit of FIG.
3 and the terminals T of the connectors TE _{1-1 to} TE _{1-3 in} FIG.
XD1 to TXD3 are input. On the other hand, the mobile phone 1
The digital output from (FIG. 8), the connector TE _1-1 through T
Through terminal RXD1~RXD3 of E _1-3, it applied to the interface portion of FIG. 7, the digital input data RXDA1
To RXDA3 to the CPU 12.

Subsequently, the communication connection device E shown in FIGS.
The operation of the QU will be described. 1. In the power supply circuit 6 shown in FIG. 5, the timing control signal TMRG from the CPU 12 is at the L level, and the B1 and B2 terminals of the relay circuit RL are directly connected to the C1 and C2 terminals. Therefore, the DC voltage +24 V is applied to the key telephone 2 _-1 through the C1 and C2 terminals of the relay circuit RL.
~ 2 _-3 TEL ₊ . However, since the key telephone 2 is in the ON hook state, no current flows through the light emitting diode D of the photocoupler, and the HKUP signal to the CPU 12 remains at the H level.

2. Preparation for making a call from the key telephone 2 When the handset of the key telephone 2 is lifted in this state,
B1 terminal of relay circuit RL → C1 terminal → Key telephone 2
TEL ₊ terminal → TEL _- terminal → C2 of relay circuit RL
Since the path from the terminal → the B2 terminal → the light emitting diode D is closed, a constant current of 30 mA flows through this closed loop. When a constant current flows through the light emitting diode D, the phototransistor TR is turned on, and the HKU to the CPU 12 is turned on.
The P signal becomes L level. This HKUP signal is sent to the CPU
12 input ports, and in response,
The CPU 12 sends an OFF hook command to the mobile phone 1 through the interface unit in FIG. 7 and the connector TE ₁ (TXD terminal) in FIG.

The portable telephone 1 transmits a dial tone (DT) signal through the RXA terminal of the connector TE _{1 in} FIG. 8 in response to receiving the OFF hook command. Dial tone signal (RXA) sent from mobile phone 1
Is transmitted to the B1 terminal of the relay circuit RL of FIG. 5 as an analog signal L ₊ of the hybrid circuit 7 of FIG. 6, is applied to the key telephone 2 via the B1 terminal and the C1 terminal of the relay circuit RL, and Is output.

3. Dial Button Operation When a dial operation is subsequently performed on the key telephone 2, a push button (PB) signal from the key telephone 2 is transmitted to the C1 terminal of the relay circuit RL in FIG.
As an analog signal L ₊ through the B1 terminal of FIG.
Is supplied to the AIN ₋ terminal of the PB receiver 15. AI
N _- a valid PB signal is applied to the terminal, PB receiver 1
5 outputs an interrupt signal MFINT, and the CPU 12
Interrupt (MF). In the interrupt processing, the CPU 12 outputs the output data D1-
D4 is read, and the output data D1-D4 is data corresponding to the numbers (0-9) and symbols (*, #, etc.) of the pressed push button. Therefore, CP
U12, in the interrupt processing, it is possible to know the dialing information sent, sends the dial information, the cellular phone 1 through TXD terminal of the connector TE ₁ in FIG.

Then, the mobile phone 1 calls the other party's phone according to the dial information sent.
Further, in response to the calling operation, and outputs a ring back tone to the RXA terminals of the connector TE _1. The ring-back tone is transmitted as an analog signal L ₊ from the hybrid circuit of FIG. 6 to the B1 terminal of the relay circuit RL, and passes through the C1 terminal of the relay circuit RL to the TEL of the key telephone 2.
Add to ₊ terminal. With this operation, the key telephone 2 can hear the ring back tone.

4. Talking operation After that, when the other party to talk to picks up the telephone, the RXA and TXA terminals of the mobile phone 1 {hybrid circuit (signal line L ₊ )} relay circuit RL} TE of the button telephone 2
L _+, TEL _- handset through the terminal is carried out.

5. End of transmission / reception (1) If the key telephone 2 is turned off first, an open loop is established between the TEL ₊ and TEL _- terminals of the key telephone 2,
The phototransistor TR is turned off and HKUP
The signal goes high. Since this signal is transmitted to the CPU 12, the CPU 12
Send a hook command. Therefore, the mobile phone 1
Is in an ON hook state, and communication with the other party's telephone is completed. (2) On the other hand, when the other party's telephone is disconnected first, the mobile telephone 1 notifies the CPU 12 of the fact through the RXD terminal. In addition, the mobile phone 1 uses the RXA
Outputs busy tone through terminal. The output busy tone is transmitted to the TEL ₊ terminal of the key telephone set 2 through the signal line L ₊ → relay circuit RL of RXA terminal → hybrid circuit 7 of Kon'nekuta TE _1. Therefore, the key telephone 2 can know that the other party has hung up the telephone.

6. Operation at Incoming Call (1) When the mobile phone 1 is called from the other party's phone, the mobile phone 1 informs the CPU 12 of the incoming call display status through the RXD terminal. Then, the CPU 12
The RING signal is set to the H level, and oscillation at 16 Hz is started (see FIG. 3). Further, the CPU 12 outputs the timing control signal TMRG at H level for one second and at L level for the next two seconds (see FIG. 5). By this timing control signal TMRG, the relay circuit RL shown in FIG.
Only when the timing control signal TMRG is at the H level,
The M1 and M2 terminals are connected to the C1 and C2 terminals,
As a result of this operation, 16 seconds from the calling circuit 4 shown in FIG.
Hz is transmitted to the TEL ₊ terminal of the key telephone 2, and a normal calling operation is realized.

(2) Lift the telephone 2 to turn it off
When the hook state is set, the HKUP signal goes low through the photocoupler, and the OFF hook state is transmitted to the CPU 12. Therefore, the CPU 12 returns the RING signal to the L level, stops the oscillation at 16 Hz, and returns the timing control signal TMRG to the L level. Further, after transmitting an OFF hook command to the mobile phone 1 and receiving an incoming call display OFF status from the mobile phone 1, a call between the mobile phone and the key phone is enabled. As is apparent, in the call state, the RXA and TXA terminals of the mobile phone 1 {hybrid circuit (signal line L ₊ )} relay circuit R
Transmission and reception are performed through the TEL ₊ and TEL _- terminals of the L⇔ button telephone.

[7] Operation at the time of special incoming call The other party's telephone (mobile phone) _Ni is the communication connection device EQ
Call the mobile phone 1 U only one call, then perform the specific reception operation when the other party hangs up the phone N _i. Hereinafter, the operation at the time of a special incoming call will be described with reference to FIG. (1) in the counterpart stage of telephones N mobile phone 1 from _i is called the, CPU 12 of the communication connection device EQU, since knows the phone number of the other party, the CPU 12 stores the telephone number of the other party , Communication connection device EQ
Call the key telephone 2 connected to U. (2) When the called key telephone 2 enters the OFF hook state, the CPU 12 sets the connector TE in FIG.
_The other party's telephone N
The dial information of _i is sent to the mobile phone 1. Then
Mobile phone 1 calls a telephone N _i in response to dial information which has been delivered, the RXA terminals of the connector TE ₁ so outputs a ring back tone, the key telephone set 2
Now you can hear this ringback tone. (3) Then, the telephone N _i is OFF hook state, the cellular phone 1 RXA, TXA terminal ⇔ hybrid circuit (signal line L ₊₎ of ⇔ relay circuit RL⇔ EKT 2 TEL _+, TEL _- handset through terminal Is performed. Then, the talking state is maintained until one of the telephone sets enters the ON hook state.

Although the embodiments of the present invention have been specifically described above, various modifications can be made without departing from the spirit of the present invention. For example, as shown in FIG. 10, between the connector TE ₂ for the relay circuits RL and EKT, the polarity inversion circuit 25 is provided, the control signal EX from the CPU 12, key telephone 2 (actually the main unit) analog signal TEL ₊ TEL to _- polarity may be to reverse the.

According to this configuration, when a call is made from the key telephone 2, the CPU 12 turns off the other party's telephone.
After confirming that the hook state has been reached, the polarity inversion circuit 25
Can be inverted. Explaining in detail with reference to FIG. 9, when the other party's telephone _Ni goes into an off-hook state, a billing signal Mn is sent from the communication carrier to the mobile telephone 1, so that the CPU 12
Outputs a control signal EX after recognizing the metering signal Mn, analog signal TEL ₊ TEL to the main unit _- reversing the polarity of. Then, in response to this, the main device can start the charging calculation, and display the usage fee on the key telephone 2 after the end of the call, or store the usage fee in the charging device.

In this embodiment, a special wiring is required for the CPU 12 to recognize the billing signal Mn sent to the mobile phone 1, but this wiring is omitted and the existing connector is omitted. when using only TE _1, for example, it may be utilized clocking operation. That is, the mobile phone 1, at the stage of finished sending the dialing information to the telephone N _i, connector signal indicating that the call state TE ₁
Since output, CPU 12, this in response to start the counting (timer) operation, and outputs a control signal EX after a certain empirically determined time, the analog signal TEL ₊ TEL to the main unit _- polarity Is inverted. In this process, the use charges calculated is somewhat inaccurate, since it is sufficient to use only existing connector TE _1, is very excellent in simplicity.

[0029]

As described above, according to the present invention,
Wireless communication can be performed from a general telephone at any time as needed. Therefore, even if the wired communication line is cut off, the disaster situation and the like can be appropriately and appropriately transmitted to the outside from the key telephones arranged at each desk of the company or government office. Since the wireless communication line can be used not only at the time of disaster but also on a regular basis, communication costs for companies can be saved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration of a communication connection device.

FIG. 2 illustrates a configuration of a control unit in detail.

FIG. 3 illustrates a 16 Hz calling circuit in detail.

FIG. 4 illustrates the DTMF circuit in detail.

FIG. 5 shows the power supply circuit in detail.

FIG. 6 illustrates the hybrid circuit in detail.

FIG. 7 illustrates an interface between a CPU and a mobile phone connector.

FIG. 8 illustrates a charging circuit of the mobile phone.

FIG. 9 is a diagram illustrating a use state of the communication connection device of FIG. 1;

FIG. 10 is a view for explaining another embodiment of the present invention.

[Description of Signs] 1 Wireless telephone (mobile telephone) 2 General telephone (button telephone) 3 Control unit 4 Call circuit 5 DTMF detection circuit 6 Power supply circuit 7 Hybrid circuit EQU Communication connection device L ₊ analog signal path

Claims (4)

[Claims] A communication connection device (EQ) which is located between a general telephone (2) and a wireless telephone (1) and mediates signal transmission and reception between the two based on the operation of a control unit (3) provided therein.
U), a call circuit (4) for generating a call signal to a general telephone (2) based on the control of the control unit (3), and the call signal based on the control of the control unit (3). And a power supply circuit (6) for intermittently transmitting a DC voltage to the general telephone (2) and constructing an analog signal path (L ₊ ) with the general telephone at other timings. A DTMF detection circuit (5), which is connected to the power supply circuit (6), converts an analog signal as dial information output from a general telephone into a digital signal, and transmits the digital signal to the control unit (3); And a hybrid circuit (7) connected to 6) for transmitting an analog signal as voice information output from a general telephone to the wireless telephone, and transmitting an analog signal from the wireless telephone to the power supply circuit. While causing the transmission operation in the wireless telephone in response to transmission operation from the telephone, the communication connection device, characterized in that the radio phone is to perform the ordinary telephone call operation when the call operation. 2. The control unit of the communication connection device, after recognizing an off-hook state of a general telephone, sets the DT.
First means for causing the wireless telephone to start a calling operation based on a digital signal from the MF detection circuit; and, when the other party's telephone goes into an off-hook state in response to the calling operation of the wireless telephone, a call operation is performed through the hybrid circuit. Second means for realizing, a third means for controlling the calling circuit and the power supply circuit to call a general telephone when a wireless telephone is called from an external telephone, and the general telephone is turned off in response to the calling operation. The communication connection device according to claim 1, further comprising: a fourth unit configured to realize a call operation through the hybrid circuit when the state is changed. 3. The control unit of the communication connection device, when a wireless telephone is called a specific number of times from an external telephone,
Fifth means for recognizing that the N-hook state has been reached, and calling a general telephone based on the recognition. When the called general telephone is in the OFF-hook state, the external telephone in the ON-hook state is called. The communication connection device according to claim 1 or 2, further comprising: a calling means. 4. The communication connection device according to claim 1, wherein the communication connection device includes an inverting unit that inverts the polarity of the DC voltage applied to the general telephone.